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    <h1 id="wblj">外部链接<a href="#low">返回底部</a></h1>
    <a href="http://www.baidu.com" target="_self">百度</a>
    <a href="http://www.baidu.com" target="_blank">百度</a>
    <h1>内部链接</h1> 
    <a href="图片路径.html">图片</a>
    <h1>空链接</h1>
    <a href="#">空链接</a>
    <h1>下载链接</h1>
    <a href="973119.zip">下载文件</a>
    <h1>网页元素的链接</h1>
    <a href="http://baidu.com"><img src="images/912922.png" /></a>
    <h1 id="low">锚点链接</h1>
    <a href="#wblj">去到外部链接</a>
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